Weld metal deposit (WMD) was carried out for standard MMA welding
process. This welding method is still promising mainly due to the high
amount of AF (acicular ferrite) and low amount of MAC (self-tempered
martensite, retained austenite, carbide) phases in WMD. That structure
corresponds with good impact toughness of welds at low temperature.
Separate effect of these elements on the mechanical properties of welds
is well known, but the combined effect of these alloy additions has not
been analyzed so far. It was decided to check the total influence of
nickel with a content between 1% to 3% and molybdenum with content from
0.1% up to 0.5%.